5/6課輔-串合併、子字串

//字串合併、子字串
#include <iostream>
using namespace std;

int main()
{
    string s1="this is s1",s2="this is s2";
    char c3[5]="char";
    cout<<"s1+s2:"<<s1+s2<<endl;
    cout<<"s1+c3:"<<s1+c3<<endl;
    s1+=c3;
    cout<<"s1+=c3:"<<s1<<endl;
    s2.append(c3);
    cout<<"s2.append(c3):"<<s2<<endl;
    cout<<"substr():"<<s1.substr(0,4);
    return 0;
}